Put in a support ticket and ask them to move your character to another zone. Had the exact same thing happen to me a few days ago. Once they moved me out of the dungeon I got stuck in my main loaded just fine. Before that all I could do was load an alt or create a new toon and play.
After server maintenance, I tried logging into my account again. The game loaded my account and I was finally at character selection. I went on my veteran character, who I last left at Deshaan. When my character loaded, I was at the same place and nothing seemed amiss.
I hope the serve maintenance fixed everyone's issues as well.